Exhibit 31.2



Certification of Chief Financial Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002



I, Kevin M. Smith, certify that:



1. I have reviewed this Annual Report on Form 10-K/A, Amendment No. 1, of Rentech, Inc.;



2. Based on my knowledge, this report does not contain any untrue statement of a material
fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;



3. Omitted



4. The registrants other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures
(as defined in Exchange Act Rules 13a-15(e) and 15d-15(e) for the registrant and have:



|a) | Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information
relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;
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|b) | Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable
assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
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|c) | Evaluated the effectiveness of the registrants disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure
controls and procedures, as of the end of the period covered by this report based on such evaluation; and
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|d) | Disclosed in this report any change in the registrants internal control over financial reporting that occurred during the registrants most recent fiscal quarter that has
materially affected, or is reasonably likely to materially affect, the registrations internal control over financial reporting;
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5. The registrants other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the
registrants auditors and the audit committee of registrants board of directors (or persons performing the equivalent functions):



|a) | All significant deficiencies and material weaknesses in the design or operation of internal control which could adversely affect the registrants ability to record, process,
summarize and report financial information; and
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|b) | Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants internal controls over financial reporting.
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|                       |  |            |  |                                                     
|---------------------- |  | ---------- |  | ----------------------------------------------------
|Date: January 30, 2006 |  |            |  | /s/ Kevin M. Smith                                  
|                       |  | Signature: |  | Kevin M. Smith                                      
|                       |  | Title:     |  | Chief Financial Officer and Executive Vice President